Sharpening machine for sharpening knives



FIG. 1 is a top plan view of the sharpening machine for sharpening knives showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a first side elevation view thereof;

FIG. 5 is a second side elevation view thereof; and,

FIGS. 6–7 are perspective views thereof.

The broken lines shown in the drawings represent unclaimed portions of the sharpening machine and form no part of the claimed design. 

The ornamental design for a sharpening machine for sharpening knives, as shown and described. 